Hello, using the OS-specific Haskell packages of the Ubuntu distribution, I have some cabal packages installed in addition, e.g. hmatrix etc. After an upgrade to Ubuntu 13.04 most of these cabal packages are broken because some dependencies do not exist anymore or have been upgraded also, respectively. With ghc-pkg check I get messages like There are problems in package hmatrix-0.14.0.1: dependency "array-0.4.0.0-0b32f6f98c0297dbb0e5cfc0087bd1f0" doesn't exist dependency "base-4.5.0.0-c8e7184681d410015e93df85fc49e9dd" doesn't exist .... Actually now array-0.4.0.1 is installed etc. What is the recommended way to repair this? Should I do a --reinstall of the cabal packages (which should mostly also work with the upgraded dependencies)? Any hint would be welcome! Best regards Johannes Engels